lost william mapother

Of all the people we've come to know over the past few years on 'Lost,' Ethan Rom is certainly one of the creepiest. He kidnapped Claire and Charlie! He helped Ben kidnap baby Alex! He shot John Locke!

Since his return this season -- as Dr. Ethan Goodspeed, who treated Claire and her pregnant belly at the hospital in "What Kate Does" -- star William Mapother sat down with us and got a little nostalgic about the day he got hired for the show. He even shared a fun fact ... about Ethan's footwear?

So will we get more Ethan off the island this season? Watch and find out ...